A geology student uses an optical instrument to inspect a small mineral sample. The instrument contains a converging lens with a focal length of 0.10 m.
The power of a lens is calculated using P=1fP=\dfrac{1}{f}P=f1, where P P\,P is in dioptres, D\text{D}D, and f f\,f is in metres, m\text{m}m.
Calculate the power of the converging lens.
93 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.